Problem with the Journalist Theme

I've noticed that for at least the last 12 hours or so, about 9 times out of 10 my sidebar has been scrunched under my posts in several versions of Internet Explorer, but not other browsers. Has anyone else with the same theme (the original one, er...v1.3?) been having the same problem?

I realise that the normal cause of that is because an image is too big, but that's not the case here. I did just add the twitter widget two days ago, but I still had no problems with the sidebar until today.

Before I forget, I just wanted to say thanks for the help. I'm still having occasional problems with IE6 on my wife's computer, but that's no big deal. Perhaps that will convince her to upgrade to IE8? :D